Ford Differentials. Joseph Palazzolo

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Ford Differentials - Joseph Palazzolo


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9⅜-inch axle can typically be found on 1961 to about 1972 larger cars, such as the Lincolns and LTDs, and the high-powered pickup trucks from about the mid 1960s to the mid 1970s. These axles had large carrier bearings with an outside diameter of 3.265 inches. Some of these use the unique 3.250-inch outside-diameter wheel end bearings as compared to the typical large bearings, which are 3.150 inches. These axles are still not as strong as nodular iron 9-inch axles. There is no aftermarket support for these axles, so there’s no reason to buy one for a high-performance or racing application. Therefore, the only reason to use one of these is for a concours-type restoration for originality.

      There are no performance upgrades so you are stuck with used parts or, if you are lucky, new old stock. As a result, I highly recommend that you avoid this axle for any performance application buildups. You will be better off in the long run.

      But there is one good side to this axle; you can swap the third member with a 9-inch unit and retain the rest. So if your vehicle already has this housing and you want to upgrade the gears and differential, you have choices. You can even put the larger 9⅜-inch third member in a 9-inch housing but you need to machine some additional ring gear clearance in the axle housing. The bolt pattern for the third member is common between the two axle housings. I am not sure why you would ever want to do that but it is physically possible.

      I could not review the history and identification of these axles without talking about the Ford part numbering system. The Ford part numbering system is well organized and structured as compared to some other original equipment manufacturers’ systems that just utilize the “next number in sequence” philosophy.

      Ford part numbers typically have three components: the prefix (three or four alpha-numeric characters) then a dash, followed by the basic number, another dash, and then the suffix or revision version. In some situations, there is even a pre-prefix with a single or double digit to help provide further clarification of the part’s history.

      Let’s look at the part number for the nodular third member that I referenced earlier as an example:

      C4AW-4025-B

      The first character is for the decade and the second digit is the year of that specific decade. The second digit is also for the year of introduction or year of last revision.

      All of the above holds true until the year 1999. It appears with the Y2K scare and other factors, Ford decided to revamp its date code strategy. Parts released in 1999 and forward follow this format:

      The third character is for the vehicle model code. For example, R3 is Mustang, H7 is F-Series Short Cab, L3 is F150/250. So a 2011 Mustang axle is part number BR3W-4001-KH.

       Ford Part Number First Character

       (8.8- & 9-Inch Axle ID)

First CharacterDecade
A1940 (often omitted)
B1950
C1960
D1970
E1980
F1990

This is a year-of-manufacture table for differentials. ...

       This is a year-of-manufacture table for differentials. The first character is the decade, from 1940 to 1990, while the second is the year in that decade. So our example (C4AW-4025-B) was introduced in 1964.

       Ford Part Number Third Character

       (8.8- & 9-Inch Axle ID)

Third DigitModel & Year
AFord/Galaxie (1958 on)
BBronco (1970–73), Maverick (1975–77), Fairmount (1978–83)
CRemanufactured Parts (1966–75), Elite (1975), Capri (1979 on)
DFalcon (1960–69), Maverick (1970–74), Granada (1975–83), LTD (1983 on)
EChassis Cab Truck (1970–73), Pinto (1976–80), Escort (1981 on)
FExport sales, Trans Am Racing
GComet (1961–67), Montego (1968–76), EXP (1982 on)
HHigh Performance Part, Medium and Heavy Truck (1966 on)
INot used
JMarine and Industrial Engines
KEdsel (1958–60), Comet (1975–77), Zephyr (1978–83), Marquis (1983 on)
LLincoln (1958–60), Mark (1961 on)
MMercury (1958 on)
NTractor (1958 on)
OFairlane (1962–68), Torino (1969–76), LTDII (1977–79), LN7 (1982–83)
PAutolite and 1962 on, Motorcraft Brand
QNot used
RRotunda Tools (1962–69), Ford of Europe (1970 on), Remanufactured parts (1976 on)
SThunderbird (1958 on)
TTruck (1958–65), Light and Medium Truck (1966–82), Bronco (1966–70, 73–82), Light Truck and Full–Size Bronco (1983 on)
UEconoline and Club Wagon Van (1961–81)
VLincoln Continental (1961–81)
WCougar (1967–80, 83 on), XR7 (1981–82)
XTruck (1970–73)
YMeteor in Canada (1962–72), Bobcat (1975–80), Lynx (1981 on)
ZMustang (1964–73), Mustang II (1974–78), Mustang (1979 on)
1Not used
2Pinto (1972–75)
3Tempo (1984 on)
4Comet (1971–74), Monarch (1975–80), Cougar (1981–82), Marquis (1983 on)
5RVs (1974–75), Continential (1982 on)
6Pantera (1971–75), Topaz (1984 on)
7Courier (1971–85), Ranger, Bronco II (1983 on), Explorer (1991 on)
8Capri (1972–75)
9Turbine Engine Parts (1970–75)

       The third character in our example (C4AW-4025-B) is an A, which indicates it is from a Ford vehicle, specifically a Galaxie from 1958 or newer.

       Ford Part Number Fourth Character

       (8.8- & 9-Inch Axle ID)

Fourth DigitDesign Engineering Office
ALight Truck Engineering Division
BBody and Electrical Product Division
CChassis
DOverseas Product Engineering
EEngine North America
FElectronics Division
GEngine Merkenich Germany
HClimate Control (1972 on)
INot used
JFord Parts and Customer Service Division
KImport Release
LFord Customer Service Division Power Products
MPerformance and Special Vehicle Operations
NVolvo
OOutside
PTransmission and Axle
QDiesel Engine
RManul Transmission
SLight and Heavy Truck Special Order Parts
TElectrical
UFuel and Handling Division
VDomestic Special Order
WAxle and Driveshaft
XPlastic and Trim
YSpecial Vehicle
ZFord Service Parts, Product Analysis
1European Product Development Center
2Land Rover
3Large and Luxury Vehicle Center
4Truck Vehicle Center
5South America Operations
6Otomobil Sanayi, Turkey JV
7Transmission and Axle
8Hybrid and Electric Vehicle
9Asia Pacific and Australia

       The fourth character represents the Engineering Operations area responsible


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